﻿<p>A medical device is attached to a medical piping system and operates upon medical gases to perform a specific function. Medical gases include medical air, medical vacuum, oxygen, carbon dioxide, nitrogen, and nitrous oxide.</p>
<p>Outlets for medical gasses should use <em>IfcValve</em> with PredefinedType equal to GASTAP, containing an <em>IfcDistributionPort</em> with FlowDirection=SINK and PredefinedType equal to COMPRESSEDAIR, VACUUM, or CHEMICAL, and having property sets on the port further indicating the gas type and pressure. Tanks for medical gasses should use <em>IfcTank</em> with PredefinedType equal to PRESSUREVESSEL, containing an <em>IfcDistributionPort</em> with FlowDirection=SOURCE and PredefinedType=CHEMICAL, and having property sets on the port further indicating the gas type and pressure range.</p> 
 
<blockquote class="history">HISTORY&nbsp; New entity in IFC4</blockquote><blockquote class="note"></blockquote>
